diff --git a/src/calibre/gui2/dialogs/metadata_bulk.py b/src/calibre/gui2/dialogs/metadata_bulk.py
index 9b6f8e53ab..b6c5fb278b 100644
--- a/src/calibre/gui2/dialogs/metadata_bulk.py
+++ b/src/calibre/gui2/dialogs/metadata_bulk.py
@@ -225,6 +225,6 @@ class MetadataBulkDialog(QDialog, Ui_MetadataBulkDialog):
         return QDialog.accept(self)
 
 
-    def series_changed(self):
+    def series_changed(self, *args):
         self.write_series = True